Main Scan Sync Control - Canon imagePRESS C1 P Service Manual

Chapter 6
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Reference:
The light density set at APC is cleared at standby mode.
Memo:
Laser On Control at 1200pdi
The image representation of one dot has only been possible only by the process at the center area of the dot. In this machine, the combination of the process at left/
right area of the dot with the one at the center area based on the peripheral dot information enables the high image quality with 1200dpi.
Related Error Code:
E100 (BD detection error)
- 0001 When the specified time passed after starting polygonal scanner, BD signal cannot be detected.
- 0002 During stable rotation of the polygonal scanner, BD signal cannot be detected.
E102 (Laser EEPROM error)
- 0001 The EEPROM checksum of the laser driver is mismatched.

6.3.1.2 Main Scan Sync Control

imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
Sync control of main scanning is the control for adjustment of the writing position in the main scanning.
This control is performed at BD sync control circuit in PWM IC.
This circuit produces the sync signal of the main scanning used in DC controller PCB based on BD signal sent from BD PCB.
Here the operation of this circuit is explained.
VIDEO signal sent from the main controller PCB is sent to FIFO in PWM IC via FIFO inside ASIC.
At the same time, BD sync control circuit produces the printer sync signal (LSYNC) inside PWM IC based on BD signal, output it to FIFO inside PWM IC.
After that, FIFO reads out the image signal to PWM IC synchronized with the printer sync signal.
PWM IC converses the image signal to the laser drive signal (LD), send it to the laser unit.
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J1170
DC-CON
Standby
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LD-A_APC-H
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LD-B_APC-H
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LD-A_APC-L
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LD-B_APC-L
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Print
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Forced OFF
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J3500
F-6-4
OFF
ON
ON
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ON
Video signal input allowed
OFF
0012-6512